AutJwr's Catalogue. 69 
TASSIN, WIRT. 
Descriptive catalogue of the meteorite collection in the United 
States National Museum to Jan. 1, 1902. (Rep. U. S. Nat. Mus. for 
1900, pp. 671-698, 3 pis., 1902.) 
WATSON, T. L. 
Occurrence of uranophane in Georgia. (Am. Jour. Sci., vol. 13, pp. 
464-466. June, 1902.) 
WILCOX, W. D. 
Recent explorations in the Canadian Rockies. (Nat. Geog. Mag., 
vol. 13, pp. 141-168, May; 183-200, June, 1902.) 
WILLIAMS, H. S. 
Fossil faunas and their vise in correlating geological formations. 
(Am. Jour. Sci., vol. 13, pp. 417-432. June, 1902.) 
WEED, W. H. 
Mineral vein formation at Boulder Hot Springs, Montana. (21 Ann. 
Rep., IT. S. G. S., part 2, pp. 227-256, pis. 32-34. 1900.) 
WHITNEY, MILTON. 
Field operations of the Division of Soils. 1900. (2 Rep., Div. of 
Soils, Dept. Agricul., pp. 473. pis. 51, 24 maps. 1901.) 
WORTMAN, J. L. 
Studies of Eocene Mammalia in the Marsh collection, Peabody 
Museum. (Am. Jour. Sci., vol. 13. pp. 433-428, pis. 7 and 8. June, 1902.) 
WRIGHT, G. FREDERICK. 
Origin and distri])ution of the Loess in northern China and Cen- 
tral Asia. (Hull. G. S. A., vol. 13, pp. 127-138, pis. 16-21. Mar. 1902.) 
CORRESPONDENCE. 
Columbia University Summer School. The eastern branch of 
the Coknnbia University summer school in geology was held this 3 ear 
at Hudson, N. Y. from June 2 to 9. It has always been the endeavor 
of this branch of the school to select a field which comliincs good 
stratigraphical, palaeontological and structural features. It was con- 
ducted last year by Mr. G. Van Ingen at Rondout, N. Y., where these 
features were excellently combined. This year Becraft mountain, near 
Hudson, N. Y.. was selected. The work was in charge of Prof. J. 
F. Kemp and Prof. A. W. Grabau, assisted by Mr. H. W. Shimer. 
The mountain is about two miles long, a mile wide, and four to live 
hundred feet high. The base is in most places composed of the so- 
called Hudson River shales, which Ruedmann has shown was a con- 
tinuous deposition from the Ijeginning of Trenton up to and including 
the Lorraine. Resting unconformably upon this and sometimes form- 
ing the base of the mountain, but usually showing as a vertical cliff 
some distance up the sides, is the Manlius (Teutaculitc) limestone. 
It is easily recognized by its finely laminated character. Lcpcrditia 
alta is especially abundant in its upper beds. Resting conforma1)ly 
upon this is the Coeymans' limestone, the Imvest stratum of the old 
lower Heldcrberg group. It is distinctly crystalline in structure; 
